Piper longiapiculatum (Piperaceae), a New Species From the Brazilian Amazon

In order to address the many lacunae in Amazonian Piper taxonomy and geography, we performed a field expedition in the Serra do Divisor National Park (Acre state, Brazil), resulting in the discovery of a new species, Piper longiapiculatum , herein described and compared to morphologically similar taxa. Illustration, photos, and a distribution map are presented. Piper longiapiculatum is diagnosed as a shrub with a stem puberulous to glabrescent, leaves with an elliptic lamina, base asymmetrical or symmetrical, with cordate‐lobed and apex acute to acuminate, with secondary veins arising up to the upper third of the midrib, inflorescence short and thick, with apex apiculate, and floral bracts crescentic‐shaped. It is solely known from the type locality by a unique specimen growing in the understory of lowland dense ombrophilous forests ( terra firme ). Its conservation status is categorized as Data Deficient (DD).